若x²+y²=8 ，则2x＋y的最大值为(    )

生活中许多地理现象与地球的自转和公转有关。据此回答下题。

小唐了解到电视机遥控是通过一种人眼看不见的光----红外线来传输信号的。他想进一步了解红外线是否具有可见光的某些传播规律．进行了探究：

实验一：在遥控器前面分别用相同厚度和大小的硬纸板与玻璃板遮挡，保持遥控器方向、遥控器和电视机的距离相间，多次按下遥控器的“开／待机”按钮，发现用硬纸板遮挡时不能控制电视机，用玻璃板遮挡时能控制电视机。

实脸二：将遥控器对准天花板，调整遥控器的方向并多次按下遥控器的“开／待机”按钮，发现遥控器处于某些方向时能控制电视机。

完形填空。通读下面的短文，根据短文内容，从 A、B、C 三个选 项中选出可以填入空白处的正确答案。

Long long ago, there was a beautiful little girl. She was 1because she had no family and no home. She only had her clothes and some bread. But she was very kind.

 A man asked her2she had something to eat. She gave him her3.

A child cried and told her that his 4was very cold. So she gave him her hat.

Then, she met a child with no coat. She gave him her coat.

One day, in the cold5forest, she met another child who

 6her dress. The little girl thought that it was dark and

7could see her, so she gave her dress away. At last, she had almost nothing: no family, nowhere to live, nothing to eat and little to wear.

8, stars fell from the sky. These stars became beautiful pieces of money. With the money, she9a new dress and a coat.

The little girl was rich for the10of her life and she still helped the people in need with her money.